28259860 has 24 divisors (see below), whose sum is σ = 60951240. Its totient is φ = 10998144.

The previous prime is 28259849. The next prime is 28259873. The reversal of 28259860 is 6895282.

It can be written as a sum of positive squares in 4 ways, for example, as 2676496 + 25583364 = 1636^2 + 5058^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18355 + ... + 19834.

It is an arithmetic number, because the mean of its divisors is an integer number (2539635).

Almost surely, 2^28259860 is an apocalyptic number.

28259860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28259860 is an abundant number, since it is smaller than the sum of its proper divisors (32691380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28259860 is a wasteful number, since it uses less digits than its factorization.

28259860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38235 (or 38233 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 28259860 is about 5316.0003762227. Note that the first 3 decimals coincide. The cubic root of 28259860 is about 304.5953964958.

The spelling of 28259860 in words is "twenty-eight million, two hundred fifty-nine thousand, eight hundred sixty".